With the alu. Oil pan that I saw on your new Indy alum. block a couple of months ago(in a pict.), there should be some hp improvement. Front of the pan and the square hole both add to more oil that will follow the rotating parts.
Have you looked at Daileys and Autoverdis billet pans for BAE hemi blocks?
Pump is placed on the right side and you have an extra wheel for belt tension. Don't know how or if the BAE billet pan will fit your Indy block and main caps?

http://www.daileyengineering.com/hemi_426.htm
http://www.autoverdi.com/pumps2.html#pan



I suspect that four roots style scavange sections with the right size(wide) would eliminate the need for an extra vacuum pump in your 572.